.switch{
    margin-left: 200px;
    margin-bottom:20px ;
}
.cars{
    position: relative;
    font-size: 18px;
    margin-bottom: 50px;
    top: 20%;
    left: 20%;
}
.echartStyle{
    width: 700px;
    height: 500px;
    margin-left:200px;
}